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Ridiculously effective, the other team actually hesitated a few times when they saw what he was doing to the turrets, but it was hilarious to see Yi go kamikaze.

By level 18, with Highlander and Wuju Style active, Yi has 180 damage and 230% of 0.679 attack speed. Each point of AD added is worth an extra 0.555% dps. Each point of attack speed added is worth an extra 0.435% dps. Each point of gold is worth 0.016% increased dps if spent on attack speed and 0.014% increased dps if spent on damage. So buying straight damage on Master Yi is less effective than buying straight attack speed (and neither is as effective as buying attack speed first and then AD). Not to say stacking AD won't be effective, it's just suboptimal.

By level 18, with Highlander and Wuju Style active, Yi has 180 damage and 230% of 0.679 attack speed. Each point of AD added is worth an extra 0.555% dps. Each point of attack speed added is worth an extra 0.435% dps. Each point of gold is worth 0.016% increased dps if spent on attack speed and 0.014% increased dps if spent on damage. So buying straight damage on Master Yi is less effective than buying straight attack speed (and neither is as effective as buying attack speed first and then AD). Not to say stacking AD won't be effective, it's just suboptimal.

You messed up somewhere in there.

Also, you forgot that for every point of AD, AS gets more effective, and vice versa.